Besides the price advantage we have compared to branded transceivers, FS.COM compatible transceivers also maintain the same performance and reliability. To satisfy our customers' needs of high performance, all of our transceivers are tested multiple times in mainstream original brand switches in our test center before shipped out. Par FS.COM

On one hand, the FS.COM 40G QSFP+ transceivers with LC interface are used for long-distance transmission over single mode fiber, and those with MTP/MPO interface are utilized for short distance transmission over multimode fiber. On the other hand, for the FS.COM 40G QSFP+ transceivers with LC interface, they cannot be split into 4x10G as they use 4 wavelengths on a pair of single-mode fibers and do not lend themselves to “splitting” into 4 pairs without substantial complexity to split out the wavelengths. For the FS,COM 40G QSFP+ transceivers with MTP/MPO interface, they can be used in 4x10G connectivity via an external 12-fiber parallel to 2-fiber duplex breakout cable, which connects the 40G transceiver to four 10G optical interfaces. Par FS.COM

FS.COM has been maintaining adequate stock level of the 40GBASE-LX4 QSFP+ transceivers in U.S. warehouse, EU warehouse and CN warehouse. As long as the products you order are all in stock, we will ship them out the same day you place your order. As for some specific products or products that have a short stock, we will keep you informed ahead of time before you place your order. Par FS.COM

The FS.COM 40GBASE-LX4 QSFP+ transceivers enable data centers running at 10G today to seamlessly upgrade to 40G without having to re-design or modify the cable infrastructure, which allows our customers to migrate their existing 10G infrastructure to 40G at zero cost of fiber and to expand the infrastructure with low capital investment. They also offer a transition path for customer planning migrations to single-mode fiber in data centers with a single transceiver that bridges the gap between multi-mode and single-mode optics. Par FS.COM

Dust and contamination can accumulate on transceiver's connectors and cause problems such as reducing the optic launch power. To ensure better connection, FS.COM strongly recommends cleaning both connectors each time you disconnect and reconnect them. FS.COM High Quality One-Push Fiber Optic Pen Cleaner for 1.25mm LC/MU Connector is the best cleaning choice for 40GBASE-LX4 QSFP+ transceivers. Par FS.COM

No. Network equipment manufacturers do not require that you use only name-brand optics. In fact, when a product fault or defect occurs in the network, and the fault or defect is not attributable to the use of third-party optics, they will continue to provide support for the affected product under warranty or covered by their support program. Par FS.COM

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I bought many optics from FS before, all fit well with my Cisco & Ubiquiti switches, and no issue during application. The package is very beautiful as usual. Also, now FS optimized the website, and I can clearly see the stock in their different warehouse, it's very helpful for my future shopping.

I compare the price of this product on FS.com with the same one on the AMAZON. I found that it's nearly half of the price of AMAZON.:) Also, works as intended for connecting to the PDU. It's so hard to buy reliable things online. I'd like to say it truly gives me more confidence to shop online. What I like most about this shop is that I have a sales representative to serve me. It's really considerable for people like me, who wants someone to follow up my order, instead of leaving the client alone after the ordering. All in all, it's awesome.

We want to label our company's logo and customized info, what surprised me is that they can do that although I just need 4pcs. I appreciated their enthusiastic and excellent service, I definitely will back to FS if I have demand in the future.

Already became the old partner with each other, always happy cooperation.

We have built business cooperation with FS.COM since more than half a year with over 10 orders. It has become our core project supplier! Their service and professional attitude satisfied us. Their Quality Control System makes us convinced about their products at the beginning. I thought the 40g transceiver is much pricier than 10g transceiver from the aspect of performance and technical method, but it indeed works good. We bought 10 pieces LX4 QSFPs in my last order, finding the modules reaching 2km over single mode fiber.

The reasons why I give 5 stars: 1.No compatibility problems so far, and I'm using a fairly wide variety of switches. They seem to have consistent performance. It's perfect. 2. There is enough stock in the USA, the transport time is fast, only took 2 days to us. 3. My sales rep. provides awesome service and she seems to be nice. I trust FS, will be back if I need.

I decided to buy 40GBASE-UNIV from Fiberstore, because I noticed they have original switch DCS-7160-48YC6-F. It is said that they tested them before shipment. I haven’t plugged them into my DCS-7160-48YC6-F, looking forward to the performance.

I have a Nexus 92304QC switch in my network with 56 40G ports. I wanted to setup a connection to several servers. I did some research and selected this QSFP because it was Cisco Compliant and the price was reasonable. It fit and worked perfectly in my switch. I recommend this QSFP and will buy another if I need it.

I recently worked with 40GbE network. I just had a crazy idea to find a 40G QSFP+ optics that could both work with MMF and SMF cables. Actually, it seems impossible for me because I have never heard about that in my experience. But Google showed me this product and took me to fs.com. After reading their product description carefully, I decided to order two pairs of them for testing. Items arrived soon. can't wait to use, worked as described. Well done!